In one in-class assignment, Yogev gave each group a $20 bill and told them they had three hours to “grow the money,” he said. While several students in the class tensed up, frustrated with the nontraditional assignment, Holmes lit up, Yogev said. Three hours later, Holmes returned with his group and $48 — the second-highest result in the class, said Yogev, who couldn’t remember exactly how Holmes earned it.